Throttle-valve.



. No.1 336 ,023. PATENTED NOR-'13, 1906.

c. 0. FAWGETT. T THROTTLE VALVE.

APPLICATION FILED DEG. 13,1906.

6 1 i I 6/ A TUE NORRIS PETERS co., wnsmuarau, n. a

CHESTER C. FAWCETT, OF NEW ALBANY, INDIANA.

THROTTLE-VALVE.

Specification of Letters Patent.

Patented Nov. 13, 1906.

Application iiled December 13, 1905. Serial No. 291.603.

To all whom it may concern:

Be it known that I, CHESTER O. FAwoETT,

- a citizen of the United States, residing at New Albany, in the county of Floyd and State of Indiana, have invented certain new and useful Improvements in Throttle-Valves, of which the following is a specification.

The present invention has for its object to rovide a locomotive-engine throttle-valve which will maintain a perfect balance, which will not leak, and which will not require grinding, thereby enabling the valve to respond more quickly when moving the lever and to remain in any adjusted position, since there is no preponderance of pressure exerted thereon in one or the other direction, also obviating the accidents traceable to leaky valves, and finally preventing the loss of time incident to the grinding of valves of the puppet type, as generally provided, as well as saving fue For a full description of the invention and the merits thereof, and also to acquire a knowledge of the details of construction of the means for effecting the result, reference is to be had to the following description and accompanying drawings.

While the invention may be adapted to different forms and conditions by changes in the structure and minor details without departing from the spirit or essential features thereof, still the preferred embodiment is shown in the accompanying drawings, in which- Figure 1 is a vertical central section of a throttle-valve embodying the invention, showing a portion of a locomotive-boiler and the throttle connections. Fig. 2 is a view similar to Fig. 1 of the throttle-valve on a larger scale, showing the same closed. Fig. 3 is a view of the parts shown in Fig. 2, the valve being'open. Fig. 4 is an end view of the valve.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The valve-casing 1 is vertically disposed and is connected by elbow 2 with the standpipe 3, the latter in turn making connection with the steam-pipe 4, which passes through the upper portion of the boiler in the usual manner. The valve-casing 1 and elbow 2 are preferably of integral formation, although this is not essential. The valve-casing approximates the form of a cylinder and receives a piston 5 and is provided near each end with annular channels or grooves 6,

partly separating portions 7, which form cylinder-sections in which ports 8 are formed; The steam-pipe has communication with the valve casing or cylinder intermediate of its ends and the cylinder-sections 7. The ports 1 I 8 of each of the cylinder-sections 7 communicate at one end with the groove 6, and the latter, opening into the cylinder, admits of the steam having unobstructed passage from both ends when the piston-valve is moved to the position shown in Fig. 3.

The piston-valve comprises heads or piston-sections 9, which are adapted to cooperate with the cylinder-sections 7 and the parts of the cylinder or valve-casing adjacent to the groove or channels 6. The edges of the piston sections or heads 9 are grooved to receive suitable packing by means of which a steam-tight joint is maintained between the piston and its casing 0r cylinder. The heads or piston-sections 9 are spaced apart a distance corresponding to approximately the distance between the grooves or channels 6, so that said grooves or channels may be covered or uncovered, as indicated in Figs. 1 and 2, according as the valve is opened or closed. The space between the piston heads or sections 9 is in communication with the elbow 2 at all times. When the piston is in the position indicated in Fig. 2, the steam is shut off and when moved to the position shown in Fig. 3 the steam is admitted into both ends of the cylinder and passes around the istonheads through the ports 8 and channe s 6.

From the foregoing it will be understood that the cylinder is open at both ends and the steam exerts an equal pressure upon opposite ends of the piston-valve. Hence the latter is perfectly balanced and is not liable to be moved from a given position and does not require the locking of the throttle-lever or other operating means for actuating the throttle-valve. The valve having a piston fit in its casing obviates ground joints, and it is not necessary to throw the engine out of commission for any very great length of time should it become necessary to pack the throttle-valve to obviate any leak.

Having thus described the invention, what is claimed as new is 1. A throttle-valve comprising a valvecasing having similar sections and ports at opposite ends, the ports at each end opening at one end through the inner walls of the re- IIO spective cylinder-sections and the ports at one end having their op osite ends leading outward through the 'va ve-casing and the ports at the other end having their 0 posite ends leading into the valve-casing, an a iston-valve arranged for operation in the va veoasing and comprising spaced piston-sections adapted to cooperate With the ported cylinder-sections.

2. A throttle-valve comprising a valvecasing having cylinder-sections at opposite ends thereof, and having annular grooves in the inner Walls of the cylinder-sections a short distance from their outer ends, and. having ports at one end leading from one of said annular grooves into the valve-casing and having other ports at the opposite end leading from the other annular groove through the outer end of the valve-casing, and a piston-valve arranged Within the valvecasing and comprising spaced piston heads or sections arranged a distance a art to correspond approximately With the istance between the annular grooves to occupy a corresponding position With reference thereto and to the respective cylinder-sections.

In testimony whereof I afiiX my signature in presence of two Witnesses.

CHESTER O. FAWCETT. Witnesses:

D. W. ORosLAND, J. HINDVALK. 

